Synthetic studies of pestalotiopsin A: asymmetric synthesis of the 2-oxabicyclo[3.2.0]heptane substructure
                                
                                    
                                        作者:Ken-ichi Takao、Hiroshi Saegusa、Tomohiro Tsujita、Takenori Washizawa、Kin-ichi Tadano                                    
                                    
                                        DOI:10.1016/j.tetlet.2005.06.133
                                    
                                    
                                        日期:2005.8
                                    
                                    A functionalized 2-oxabicyclo [3.2.0]heptan-3-one derivative, possessing all the skeletal carbons of pestalotiopsin A, has been synthesized. For the preparation of intermediary cyclobutane derivatives in enantioenriched form, the Lewis acid-catalyzed [2+2] cycloaddition of N-propiolated Oppoizer's camphorsultam with dimethylketene bis(trimethylsilyl) acetal followed by a stereo-selective 1,4-hydride addition/protonation, has been developed. (c) 2005 Elsevier Ltd. All rights reserved.